College students include junior college students, undergraduates and graduate students (master students and doctoral students). There are two grades and three grades: (Grade two: advanced university-undergraduate; Universities-postgraduate higher education: undergraduate, master, doctor). No matter what kind of study. In the strict sense of international practice, the level of "bachelor, master and doctor" is the most important hierarchical form for college students. At present, 89% of China's talent market has a college education or above (headed by a college).